Assessment of bimanual proprioception during an orientation matching task with a physically coupled object

Area of Science:

• Neuroscience
• Biomechanics
• Rehabilitation Science

Background:

• Proprioception assessment is vital for sensorimotor impairments.
• Current methods often lack ecological validity, focusing on unimanual tasks.
• Bimanual manipulation is crucial for many daily activities.

Purpose of the Study:

• To develop and validate a new device and method for assessing bimanual proprioception and force production.
• To simulate realistic bimanual object manipulation tasks.
• To investigate the influence of rotation axis and target orientation on bimanual proprioception.

Main Methods:

• Developed a sensorized box for physically coupled bimanual interaction.
• Twelve healthy participants performed orientation matching tasks about three principal axes.
• Evaluated proprioception with and without added weights, and assessed force production.

Main Results:

• Bimanual proprioception accuracy varied with the axis of rotation and target orientation relative to the body.
• Force application increased with larger rotation magnitudes for the same axis.
• Fatigue led to undershooting in orientation matching tasks.

Conclusions:

• The developed tool realistically simulates bimanual tasks for proprioceptive assessment.
• Findings highlight the importance of body-centered reference frames in bimanual proprioception.
• This technology holds potential for assessing and treating sensorimotor deficits in functional tasks.